Credit Card Payoff Calculator
See exactly how much extra payments save on interest — and how many months they shave off your debt. Compare a fixed base payment with an accelerated payoff side-by-side.
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These calculators provide estimates for educational purposes only. Results are not guaranteed and should not be treated as financial advice. Always consult a qualified professional before making major financial decisions.
A payment plan is easier to evaluate when you can see both the payoff time and total interest. For example, under this calculator's monthly-compounding model, a $5,000 balance at 23% APR takes about 35 months and about $1,872 in interest at $200 per month. At $300 per month, it takes about 21 months and about $1,082 in interest. Real statements may differ because issuers can use daily balances, fees, and different minimum-payment rules.
Read more - how it works, tips & FAQs
How to use this calculator
- Enter your total credit card balance and the APR your card charges (check your latest statement or online portal).
- Enter the fixed monthly payment you want to compare. Use the amount on your statement if you are modeling your current plan.
- Enter the extra amount you can realistically throw at the card each month. Even $25 makes a difference over time.
- See payoff time and total interest for the base payment and the base payment plus your extra amount.
How to calculate this by hand
Payoff months = –log(1 – (r × P / M)) / log(1 + r)
r = monthly APR (annual ÷ 12), P = balance, M = monthly payment. This calculates how many months to pay off at a fixed payment. Warning: if M ≤ r×P (payment ≤ monthly interest), the log goes negative and the debt never decreases — that is the minimum-payment trap.
Worked example: $5,000 balance at 22% APR, paying $200/month
- Monthly rate: r = 22% ÷ 12 = 0.01833
- Check the trap: r × P = 0.01833 × 5,000 = $91.67 monthly interest
- Since M ($200) > $91.67, the debt WILL decrease. Good.
- Plug in: –log(1 – (0.01833 × 5000 / 200)) / log(1 + 0.01833)
- = –log(1 – 0.45825) / log(1.01833)
- = –log(0.54175) / log(1.01833)
- ≈ 33.8 months, rounded up to 34 monthly payments
Answer: About 34 months to pay off and about $1,750 in interest under this monthly-compounding model.
What does an extra $100/month actually do?
- Starting balance: $5,000 on one card at 22% APR
- Base fixed payment: $200 per month
- Accelerated fixed payment: $300 per month
- At $200 per month: about 34 months and about $1,750 in interest
- At $300 per month: about 21 months and about $1,022 in interest
- Estimated difference: about $728 less interest and 13 fewer months
Result: In this model, adding $100 per month saves about $728 and shortens payoff by about 13 months.
Tips
- Keep a workable cash buffer: Before sending every spare dollar to a card, consider whether an unexpected expense would force you to borrow again. The right buffer depends on your situation.
- Round up every payment: If your minimum is $143, pay $150. If it is $287, pay $300. The rounding alone can save you months over the life of the debt.
- Compare the highest APR first: With the same payment budget, directing extra money to the highest-rate card generally reduces interest. Keep required payments current on every account.
- Check your autopay options: If your issuer does not support a custom automatic amount, use a reminder for the extra payment while keeping at least the required payment on autopay.
Common mistakes to avoid
- Closing an account without checking the tradeoffs - Closing a card can reduce available credit, but keeping an account open can also involve fees or misuse risk. Review the account terms and your own needs first.
- Using a balance transfer without a plan - A 0% balance transfer buys you 12-18 months of interest-free time, but the balance still needs to be paid. Divide the balance by the promo months and set that as your minimum. If you cannot afford that, do not transfer.
- Paying only once per month - Credit card interest is calculated daily. Making two smaller payments per month (synchronized with paychecks) reduces the average daily balance and saves interest - even if the total payment is the same.
FAQ
What happens if I miss a payment while on an accelerated plan?
A single late payment can trigger a penalty APR (often 29.99%), eliminate your grace period, and undo months of progress. Set up minimum autopay as a safety net, then manually pay the extra amount.
Does paying off a card immediately improve my credit score?
A lower reported balance can reduce credit utilization, which may affect a score. The timing and size of any change depend on the scoring model, reporting date, total credit profile, and other factors.
Should I use a tax refund or bonus to pay down credit cards?
A lump-sum payment reduces the balance on which interest accrues, but the decision also depends on emergency savings, upcoming bills, and other high-priority needs. Model the payment here, then consider the rest of your budget.
Related resources
- How to Pay Off Credit Card Debt Fast - Multiple strategies ranked by speed and completion rate.
- Balance Transfer vs. Payoff Plan - Which actually saves more when you run the numbers?
- Debt Snowball vs. Avalanche - Compare strategies for paying off multiple cards.